Public-key cryptographic schemes secure against an adaptive chosen ciphertext attack in the standard model

US20020146117A1Inactive Publication Date: 2002-10-10HITACHI LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
HITACHI LTD
Publication Date
2002-10-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A public-key cryptographic scheme of high efficiency capable of verifying security in a standard model. In order to retain security against adaptive chosen ciphertext attacks, a ciphertext is generated by a combination of a plaintext and random numbers so that an illegal ciphertext input to a (simulated) deciphering oracle is rejected.
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Description

[0001] The present invention relates to a public-key cryptographic scheme and cryptographic communications using public-key cryptography.DESCRIPTION OF THE RELATED ART

[0002] Various types of public-key cryptographic schemes have been proposed to date. Of these schemes, the most famous and most practical public-key cryptographic scheme is described in:

[0003] a document 1: "R. L. Rivest, A. Shamir, L. Adleman: A method for obtaining digital signatures and public-key cryptosystems, Commun. of the ACM, Vol. 21, No. 2, pp. 120-126, 1978".

[0004] Efficient public-key cryptographic schemes using elliptic curves are known as described in:

[0005] a document 2: "V. S. Miller: Use of Elliptic Curves in Cryptography, Proc. of Crypto'85, LNCS218, Sprinter-Verlag, pp. 417-426 (1985);

[0006] a document 3: "N. Koblitz: Elliptic Curve Cryptosystems, Math. Comp., 48, 177, pp. 203-209 (1987)"; and the like.

[0007] Known cryptographic schemes capable of verifying security against chosen plaintext attacks i...

Claims

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